Healers who rescue pull tanks into mobs.

[Packetdancer]

Are you talking pre-5.0 shirk? Before tank stance overtook all of life and everything?

I might be wrong, so I mean I'm happy to learn something new but shirk only gives 25% of your enmity to someone and with the enmity leads tanks stance gives now, it's pretty damn hard to shirk someone and have it stick unless its another tank that was close in enmity.

It's far harder than it apparently was back in earlier versions (though I admit I'm going on hearsay here; I was gone for like... most of Heavensward and all of Stormblood, and only came back with Shadowbringers), but it's still possible. I've never seen it happen accidentally that a tank bumps shirk and vaporizes someone when they meant to click another ability, as I'm told was possible previously, but I have seen it done deliberately. AoE just enough to get initial aggro, single-target one mob without any AoEs after that, and you can let the rest of the party get close enough in enmity that you can shirk onto one of them. There was a tank trolling a sprout healer in Aurum Vale that way a while back when I was in Leveling roulette as DPS (leveling SAM); they'd run around the first room pulling everything but being careful not to generate too much enmity, select the healer, and Shirk onto them while laughing in party chat. (We vote-kicked the jackass.) It definitely requires intent to troll that way, though, because there's prep-work involved.

To be honest, it's easier to troll people by pulling a bunch but not building past initial enmity, then dropping tank stance and letting the mob eat the healer's face. (...and there may be an argument in there for forcing tank stance on in Light Party content and not allowing it to be turned off, now that I'm thinking about that. Honestly, that'd also spare the general annoyance of "oh crap I got level synced for this and forgot to turn tank stance back on" that sometimes happens, so I doubt that's a change that anyone would object to.)

Regardless, there's no reason I can see that Shirk should even exist outside of endgame raiding.